I think the "Y" harness question is a perfect example. I think some pilots have a strong opinion on this type of set up. The bottom line is there are many ways to approach it. Heck, if you wanna get old school, use torque rods or golden rod cables to your ailerons, allowing the use of 1 servo! If it works for you. Or get a power expander and plug all 4 of your ailerons into different channels to give the ultimate in trim capabilities.

A good example of not necessarily being able to give an exact answer, without all of the information.